OFFSET
0,1
REFERENCES
Ch. Eslahchi, S. Alikhani, M. H. Akhbari, Hosoya polynomial of an infinite family of dendrimer nanostar, Iranian J. Math. Chem. 2 (2011) 71-79.
LINKS
Index entries for linear recurrences with constant coefficients, signature (19,-150,636,-1560,2208,-1664,512)
FORMULA
a(n) = -958+2^n*(896*n^2-2904*n-19861)+4^n*(3136*n^2-11928*n+20890). Theorem 5 of the Eslahchi et al. paper contains a less explicit formula for the hyper-Wiener index.
G.f.: (71+2347*x+4376*x^2-17716*x^3-17696*x^4+2752*x^5)/((1-x)*(1-2*x)^3*(1-4*x)^3). - Bruno Berselli, Dec 30 2012
MAPLE
a := proc (n) options operator, arrow: -958+2^n*(896*n^2-2904*n-19861)+4^n*(3136*n^2-11928*n+20890) end proc: seq(a(n), n = 0 .. 18);
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Emeric Deutsch, Dec 30 2012
STATUS
approved